(C++) ProtectedExample1

 

Technical facts

 

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• Console application

C++ standard:

• C++11

Compiler(s):

• G++ 4.9.2

Libraries used:

• STL: GNU ISO C++ Library, version 4.9.2

 

 

 

 

 

Qt project file: ./CppProtectedExample1/CppProtectedExample1.pro

 

---

TEMPLATE = app CONFIG += console CONFIG -= app_bundle CONFIG -= qt QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++ -Werror SOURCES += main.cpp

 

 

 

 

 

./CppProtectedExample1/main.cpp

 

---

struct Base {   Base(const int x = 0) : m_x(x) {}   virtual ~Base() {}   protected:   int m_x; }; struct Derived : public Base {   void SetX(const int x) { m_x = x; } //For a derived class, m_x is public }; int main() {   Base b;   //b.m_x = 0; //Not allowed! Only derived classes have access to Base::m_x   Derived d;   d.SetX(42); }